| 时间 | 值 （万人） | 世界排名 |
|---|---|---|
| 2016 | 19.6 | 172 |
| 2015 | 19.3 | 172 |
| 2014 | 19.1 | 172 |
| 2013 | 18.7 | 172 |
| 2012 | 18.1 | 172 |
| 2011 | 17.7 | 173 |
| 2010 | 17.3 | 173 |
| 2009 | 17 | 173 |
| 2008 | 16.8 | 173 |
| 2007 | 16.6 | 172 |
| 2006 | 16.3 | 172 |
| 2005 | 16.1 | 172 |
| 2004 | 15.8 | 172 |
| 2003 | 16.1 | 172 |
| 2002 | 16 | 171 |
| 2001 | 16 | 171 |
| 2000 | 15.6 | 171 |
| 1999 | 15.4 | 169 |
| 1998 | 15.2 | 168 |
| 1997 | 15.1 | 167 |
| 1996 | 14.9 | 167 |
| 1995 | 14.8 | 166 |
| 1994 | 14.6 | 166 |
| 1993 | 14.6 | 165 |
| 1992 | 14.4 | 166 |
| 1991 | 14.3 | 167 |
| 1990 | 13.8 | 167 |